Unspecified impact via zero-size ring rounding
Published Oct 18, 2026 · Updated Oct 18, 2026
Undefined zero-size rounding in Linux fbnic allows local users to trigger unspecified impact via ethtool ring-size requests. The fbnic_set_ringparam() function passes untrusted zero ring sizes to roundup_pow_of_two() before minimum-size validation, invoking undefined behavior. Reachability requires access to ring configuration on an fbnic device; the public description does not establish a crash, data disclosure, or privilege escalation.
Summary
What happened
Undefined zero-size rounding in Linux fbnic allows local users to trigger unspecified impact via ethtool ring-size requests. The fbnic_set_ringparam() function passes untrusted zero ring sizes to roundup_pow_of_two() before minimum-size validation, invoking undefined behavior. Reachability requires access to ring configuration on an fbnic device; the public description does not establish a crash, data disclosure, or privilege escalation.
The record
- CVE
- CVE-2026-98585
- Published
- Oct 18, 2026
- Updated
- Oct 18, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Oct 18, 2026CVE publishedPublication date reported by the CVE source.
- Oct 18, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=6.15
- Affected versionversion=6cbf18a05c06090d867ef417a2a30b214d42d171 <0160953d8eec75c3c55562158c46442ff1fd410b
- Affected versionversion=6cbf18a05c06090d867ef417a2a30b214d42d171 <491aa3167ae02f219cb2d2de6f4196d28dca03be
- Affected versionversion=6cbf18a05c06090d867ef417a2a30b214d42d171 <92c9f2ea634d92adff5403d231ebeda683c5685a
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Activity data is delayed. The latest report is Sep 28, 2026.
Weakness, pattern, technique
No sourced classifications are available.
Public exploit references
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Technologies
Your stack
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Your stack
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